Brockton, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.7 °F (low) to 60.5 °F (high). Annual precipitation averages 50.7 Inches. Brockton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.4 °F | 37.4 °F | 4.19 in. |
| February | 20.5 °F | 39.5 °F | 3.61 in. |
| March | 27.8 °F | 46.6 °F | 5.25 in. |
| April | 37.5 °F | 58.3 °F | 4.63 in. |
| May | 47.2 °F | 68.6 °F | 3.55 in. |
| June | 56.6 °F | 77.6 °F | 3.93 in. |
| July | 62.7 °F | 83.3 °F | 3.44 in. |
| August | 61.1 °F | 82.0 °F | 3.69 in. |
| September | 53.9 °F | 74.8 °F | 3.91 in. |
| October | 42.6 °F | 63.1 °F | 5.05 in. |
| November | 33.4 °F | 52.5 °F | 4.4 in. |
| December | 25.2 °F | 42.7 °F | 5.01 in. |
| Annual | 40.7 °F | 60.5 °F | 50.66 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |